CN110878495B - Paper pulp molding equipment with honeycomb type electric permanent magnet fast mould locking device - Google Patents
Paper pulp molding equipment with honeycomb type electric permanent magnet fast mould locking device Download PDFInfo
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- CN110878495B CN110878495B CN201911002115.3A CN201911002115A CN110878495B CN 110878495 B CN110878495 B CN 110878495B CN 201911002115 A CN201911002115 A CN 201911002115A CN 110878495 B CN110878495 B CN 110878495B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
- D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
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- H—ELECTRICITY
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- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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- H05B3/40—Heating elements having the shape of rods or tubes
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Abstract
The invention discloses paper pulp molding equipment with a honeycomb type electric permanent magnet rapid mode locking device, which comprises a magnetic workbench, wherein a mold is arranged on the magnetic workbench, and the magnetic workbench comprises a working stress surface and an induction electromagnetic ring. The invention realizes the quick die change of the paper pulp molding product forming equipment through the quick locking and releasing of the die, the used die can accurately control the temperature, the temperature deviation is controlled within +/-2 ℃, the energy consumption is reduced, and the temperature rise time is controlled within 10min, thereby improving the production efficiency and the machine utilization rate.
Description
Technical Field
The invention relates to the technical field of paper pulp molding, in particular to paper pulp molding forming equipment with a honeycomb type electric permanent magnet rapid mode locking device and an operation method thereof.
Background
Along with the increasing market competition, industrial products are updated more and more quickly, coexisting varieties are more and more, the conditions of multi-variety, medium and small batch and mixed flow just-in-time production in production become mainstream, therefore, the interval time of mold replacement is shorter and shorter, namely, the frequency of mold replacement is higher and higher, the downtime of a corresponding matched machine table is greatly increased, the production efficiency and the machine utilization rate are seriously influenced, and the delivery cycle is prolonged. If the problem of rapid die and line changing cannot be effectively solved in automatic production, the automation degree of other links is high, the utilization rate of equipment is difficult to be fully improved, the production efficiency is difficult to be improved, and the problem has a perfect solution, namely: a fast mold change System (SMED) was used, and Single Minute Exchange of Die, originated in Japan in 50 s, developed by Shigeo Shingo in Toyota, meaning less than 10 Minutes (Minutes). Originally used in automotive manufacturers to achieve fast switching (Exchange of Dies), it helped the Toyota enterprise product switching time to be reduced from 4 hours to 3 minutes. As the name implies, the purpose is to shorten the job transition time, and the key point is to define the internal job transition and the external job transition, change the internal job transition into the external job transition as much as possible, and then shorten the internal and external job transition time as much as possible.
In the field of pulp moulding, rapid mould changes are also required in order to achieve factory automation. At present, the forming machine mainly has two types of structures, namely a reciprocating type and a turnover type, and as for a turnover type forming machine (the technical application related to the patent is based on a turnover type structure for expansion analysis), the forming machine is developed to a fourth generation machine (a working table surface size 1260 x 960) by a first generation prototype machine (a working table size 960 x 550) through continuous improvement, the machine table is also expanded by the original simple structure, the function is single, the structure is reasonable, the multifunctional direction is transited, but a certain distance exists from full-automatic production, such as: the upper die and the lower die of the die need manual operation, the die needs manual carrying when moving, the auxiliary equipment is limited to manual lifting equipment, and the time and labor consumption during the process become a part of the production and operation cost. The invention aims to provide a honeycomb type electric permanent magnet rapid mode locking device, which is structurally improved on the basis of the existing forming equipment of a pulp molding product, and realizes rapid mode change of the pulp molding product forming equipment through rapid locking and releasing of a mold.
In addition, the main heat source transferring modes of the conventional paper-plastic hot-press forming station comprise two modes: the first is high temperature heat conducting oil which conducts heat to the die through an oil path of the workbench, and the second is 12 or 24 resistance wire heating rods which are distributed on the side of the workbench to heat the die. The traditional heating mode, wherein the temperature comes from the machine table side, is heated by the heat conducting element and then transferred to the pulp molding machine mold, has several significant defects in heat exchange: 1. the loss in the heat conduction process is serious, the energy consumption is large, and the energy waste directly causes the increase of the factory cost; 2. the deviation value is large in the energy exchange process, and the heating is not uniform (the deviation is up to more than 10 ℃ after verification), so that the product is heated to different degrees due to different temperatures, has different shrinkage rates, and has more wrinkles, fractures and deformations and lower yield; 3. the mold has long heating time and even can not reach the process temperature, thus seriously affecting the production efficiency and the machine utilization rate.
In summary, the transition from traditional manufacturing to a lean time-based approach is one of the objectives of this patent, achieving flexible production, low in-process inventory, and shorter mold change times to achieve the end goal of rapid response to customer demand changes.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the reformation and optimization of the forming equipment based on the existing pulp molded product, the quick die change of the pulp molded product forming equipment is realized through the quick locking of the die, the used die can accurately control the temperature, the temperature deviation is controlled within +/-2 ℃, the energy consumption is reduced, the temperature rise time is controlled within 10min, and therefore, the production efficiency and the machine utilization rate are improved.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the honeycomb type electric permanent magnet fast mode locking device of the pulp molding forming equipment comprises a magnetic workbench, wherein a mold is arranged on the magnetic workbench, and the magnetic workbench comprises a working stress surface and an induction electromagnetic ring.
The magnetic workbench is provided with a temperature detection device, a magnetic flux detection device (used for controlling suction), a distance sensing device (sensing whether a die is installed on the magnetic workbench) and a power failure self-locking device. The application temperature on the paper-plastic molding equipment has great influence on electromagnetic induction, and when the temperature exceeds 130 ℃, the magnetic force fails, so that a temperature detection device is arranged on the magnetic workbench to detect and monitor temperature change. The induction electromagnetic coils and the magnetic saturation detection device on the magnetic workbench are uniformly distributed in a honeycomb shape.
In order to control the suction force to the mould, a magnetic flux detection device can be arranged on the magnetic workbench to carry out magnetic saturation detection, after the workbench is electrified, a set safety value of certain magnetic suction force needs to be reached, the machine can work further, and if the set safety value is lower than the set value, certain risk exists.
The distance sensing device can be a proximity sensor, and the distance sensing device can detect whether a bearing object (mold) exists on the workbench in real time, and the machine can work further only when the bearing object (mold) is loaded.
The magnetic workbench can be further provided with an accidental power failure self-locking device, the demagnetization function can be automatically locked when an accidental power failure occurs in the operation process, and the self-locking function can be manually eliminated after power is supplied again. This function prevents accidental injury from occurring.
The magnetic pole structure of the magnetic workbench is designed as follows, a steel shell is arranged outside the magnetic pole, an induction electromagnetic coil is arranged right below the magnetic pole, and epoxy resin is filled in the gap inside the magnetic pole block at the upper part of the magnetic pole so as to prevent liquid from entering the magnetic pole and burning the coil. The whole magnetic pole is of a solid structure and has enough strength and rigidity. The size and height ratio of the upper layer and the lower layer can be optimally determined according to the strength requirement of the magnetic field. The optimal magnetic circuit system consists of an electromagnetic magnetic field controlled by an electric pulse switch and a permanent magnetic field using a permanent magnetic material.
The specific operation steps are as follows:
the magnetic poles have the following conditions during magnetization and demagnetization:
a. and (3) locking the mould: when current is introduced into the coils on the left side and the right side of the lower part of the magnetic pole, the magnetic field intensity of the electric control magnetic field is the same as the magnetic induction intensity direction of the permanent magnet magnetic field, the magnetic field intensity reaches the maximum, magnetic attraction is generated on a mould or a workpiece placed on the surface of the sucking disc through the magnetic induction lines, the external characteristic is magnetization, and the mould is in a clamping state;
b. and (3) loosening operation of the mold: when the coils on the left side and the right side of the lower part of the magnetic pole are reversely electrified to enable the direction of the magnetic induction intensity of the electric control magnetic field to be opposite to that of the permanent magnet magnetic field, the magnetic field intensity reaches the minimum, the external representation is demagnetization, and the mold is in a loose state.
The electrifying time for magnetizing or demagnetizing the electric permanent magnetic chuck is generally less than 1s, and the clamping and loosening efficiency of the workpiece or the die is very high.
Basic working principle of the workbench circuit:
(1) magnetizing process
Referring to the circuit diagram, when a magnetizing button SB2 is pressed, a contactor KM1 is electrified to attract and self-lock, a main contact is closed, a coil of a workbench YH is electrified, and the workbench magnetizes and attracts a mold; meanwhile, the KM1 assists in breaking the break contact, so that the KM2 cannot be electrified, and the interlocking is realized. When the mold needs to be molded after the mold is produced, SB1 is pressed down first, the DC power supply on YH is cut off, and further demagnetization is needed because both the worktable and the mold contain residual magnetism.
(2) Demagnetization process
Pressing a click button SB3, powering on and attracting a contactor KM2, closing two main contacts of the contactor, and introducing reverse direct current to an electromagnetic workbench to demagnetize the workbench and a die; in order to prevent the work table from being reversely magnetized due to an excessively long time and to suck the mold again during demagnetization, the contactor KM2 adopts inching control.
(3) Description of the elements
The protection device comprises discharge resistor R, capacitor C and undervoltage relay KUD, and the effect of resistor R and capacitor C is, at the in-process that magnetizes, electromagnetic worktable stores magnetic field energy, in the one-time that breaks away from the power, the both ends of induction coil YH produce great self-induced electromotive force, can make coil and other electrical components damage, consequently constitute discharge circuit with resistor and capacitor, utilize the characteristic that the voltage on capacitor C both sides can not break suddenly promptly, make YH both ends's voltage change tend to slow down, utilize the resistance to consume the electromagnetic energy.
The forming equipment is matched with the magnetic workbench and the control device, the control box is connected with the upper die magnetic workbench and the lower die magnetic workbench, and the workbench feeds back information and displays the information through an operation screen (connected to the forming machine).
After each item of detection passes through the back magnetic force workstation and begins normal work, the mould is in the locking state promptly, and the mould has been fixed on the board, can start the temperature control case this moment, and the mould heating coil in the control mould begins to heat until the settlement temperature.
The mold comprises a mold heating ring and a temperature control device, wherein the mold heating ring is grooved around the mold cavity and/or the mold core, and the mold heating ring is arranged in the groove.
The temperature control device is connected with the mold heating ring, is arranged on one side of the machine table and has the functions of temperature setting and monitoring. The forming machine controls the heating temperature of the workbench through the temperature control element, and the mold heating ring is integrated on the inner side of the forming machine through line group connection.
The basic structure of the heating ring of the die is a heating pipe, and the specific structure is the prior art, such as: the metal tube is provided with an electrothermal element and is led out by a lead-out rod, the gap part is tightly filled with crystallized magnesia powder with good heat resistance, heat conductivity and insulativity, and the tail part is added with a threaded sleeve and a sealing porcelain head for fixed installation.
Furthermore, the mold heating ring is arranged in the groove, and a U-shaped copper pressing strip is added to the upper half part of the mold heating ring to be attached to the surface of the mold to play a role in heat conduction and sealing.
Furthermore, the mold core is embedded into a mold plate or a non-embedded integral mold core mold plate, the heating ring is provided with a groove around the mold core on the mold plate, the heating resistance wire is arranged in the groove, and then the mold core is filled with a thermal insulation material (such as epoxy resin).
The working principle is as follows: the heating temperature is set through the temperature control box, the current is conducted to the periphery of the mold core when the temperature of the current rises to the set temperature through the resistance of the heating tube in the mold heating ring, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple, or the power supply is recovered when the temperature is lower than the lower limit of the set value. The heating ring is formed by slotting the periphery of the mold core on the template, and filling the heating resistance wire in the mould core by using a thermal insulation material, so that heat can be conducted to the mold core and not to the surface of the mould, and the heat loss is avoided.
The design of the heating ring loop of the mold is required to comply with the requirement of heat balance, and the temperature deviation of the mold cavity/mold core periphery of the mold is controlled within +/-2 ℃. The loop design required for different mold cavity/core arrangements is also different, so that a thermal balance analysis is required. The temperature of the mold core is guaranteed to be uniform as much as possible, and the precision can reach +/-0.5 ℃.
The total power of the upper and lower templates of the hot pressing station is designed to be 84kw, time and electricity are saved at the moment, the coil designed by the device according to the maximum power value can ensure that the time required by the die to rise from the room temperature to the working temperature (130 ℃) is controlled within 10min, and the sizes of the heating tube and the resistance wire need to be calculated and considered according to the maximum power value.
The mold is designed by the following steps:
(1) grooving around the mold cavity and/or the mold core, and placing the mold heating ring in the groove; the heating ring of the mould is arranged in the groove, and a U-shaped copper pressing strip is added on the upper half part of the heating ring to be attached to the surface of the mould to play a role in heat conduction and sealing;
further, the core is loaded into the form by integral or inlaid means and then filled with a thermally insulating material (e.g., epoxy);
(2) arranging a plurality of thermocouples on the die, and measuring the temperature of the die;
(3) and a temperature control box is arranged and connected with the mold heating ring and the thermocouple to set and monitor the temperature.
And (2) a thermal balance analysis step is further included before the step (1), and the heating coil loop design of the die is carried out according to the thermal balance requirement. As shown in fig. 2, the adjacent positions of the two mold heating rings need to design a loop according to heat balance analysis, so that the phenomenon that the temperature of the mold core is uneven due to the fact that some parts of the mold core absorb large heat and some parts absorb small heat is avoided.
The heating temperature is set by the temperature control box, the current is conducted to the periphery of the mold by the heating tube resistor when the temperature of the heating tube resistor is increased to the set temperature, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple or is recovered when the temperature is lower than the lower limit of the set value. The temperature uniformity of the mold core is guaranteed as much as possible, the temperature deviation of the periphery is controlled within +/-2 ℃, and the precision can reach +/-0.5 ℃.
The invention also claims paper pulp molding equipment, which comprises a molding machine, the honeycomb type electric permanent magnet rapid mode locking device and a mold, wherein the mold comprises the mold heating ring and a temperature control device, the molding machine is connected with a temperature control box and the mold heating ring, and the operation is controlled by a PLC and displayed on an operation screen of the molding machine in real time.
The technical scheme of the invention has the beneficial effects that:
the paper pulp molding equipment with the honeycomb type electric permanent magnet rapid mode locking device has the following advantages that:
1. and (3) fast die changing: with the cooperation of a small amount of manual auxiliary operation, the time for loading and unloading the forming die once can be controlled within 15 minutes.
2. Accurate temperature control: the design of a heating ring loop of the mold is required to comply with the requirement of heat balance, the temperature deviation of the circumference is controlled within +/-2 ℃, the temperature of the mold core is uniform, and the precision can reach +/-0.5 ℃. After the heating resistance wire is placed, the heating resistance wire is filled with a thermal insulation material, so that heat can be conducted to the mold core and not to the surface of the mold, and heat loss is avoided; the temperature control is real-time and accurate, and the surface temperature of the paper pulp molding shaping die is ensured to be consistent, so that the dimensional stability of the paper pulp molding product is ensured, the product deformation is reduced, and the like, and the yield of the paper pulp molding product is improved, and the power consumption is reduced.
3. The power consumption is reduced, the power is designed to be 108kw (24 heating pipes on the upper and lower working tables) in the traditional working table heating mode, the heating time is 30min to the target temperature, the power is designed to be 84kw in the heating device, the heating time is within 10min to the target temperature, the design is efficient, energy is saved, electricity is saved by more than 300%, and the production efficiency and the machine utilization rate are improved.
The forming equipment of the paper pulp molding product uses a honeycomb type electric permanent magnet rapid mode locking device and a mold constant temperature coil heating device to form an effective SMED system which meets the requirements of the molding industry.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a magnetic force workbench of the honeycomb type electro-permanent magnet fast mode locking device of the present invention;
FIG. 2 is a schematic view of a heating ring structure of the mold of the present invention;
FIG. 3(1) is a schematic view of a heating ring structure according to the present invention;
FIG. 3(2) is a schematic view of a heating tube structure;
FIG. 4 is a schematic diagram showing the distribution of magnetic induction lines of the honeycomb type electric permanent magnet fast mode locking device according to the present invention;
a is a magnetizing state; b is a demagnetization state;
FIG. 5 is a circuit diagram of a magnetic force workbench of the honeycomb type electro-permanent magnet fast mode locking device of the present invention;
FIG. 6 is a schematic structural view of a molding apparatus of the present invention.
Description of reference numerals:
1-hot pressing lower die, 2-die heating ring, 3-thermocouple, 4-interface, 5-die core, 6-U-shaped copper pressing strip, 7-resistance wire, 8-stainless steel shell, 9-die, 10-thermocouple connection, 11-temperature control box, 12-operation screen, 13-forming machine, 14-connection device, 15-fastener, 16-stainless steel shell, 17-insulating magnesium chloride, 18-heating tube resistance wire, 19-non-heating area, 20-heating area, 21-wire group 1, 2; 22- wire group 3,4,5, 6; 200-a magnetic workbench; 201-a thermocouple; 202-an induction coil; 203-magnetic saturation detection means; 204-a workbench stress surface; 205-negative pressure air hole; 206-a proximity sensor; 207-junction box; 410-a main control box; 411-upper mold magnetic force workbench; 412-lower mold magnetic bench; 413-power supply. AC-main control box; a TC-transformer; an RC-rectification circuit; an FU-fuse; KUD-undervoltage relay; a KM-contactor; r-resistance; c-capacitance; SB-jog button; YH-induction coil.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Examples
Fig. 1 shows a honeycomb type electromagnetic permanent-magnet fast mold locking device of a pulp molding device, a mold 9 is arranged on a magnetic workbench 200, and the magnetic workbench 200 comprises a working force bearing surface 204 and an induction electromagnetic coil 202. The magnetic workbench is provided with a thermocouple 201, a magnetic saturation detection device 203, a proximity sensor 206 and a power failure self-locking device. The application temperature on the paper molding apparatus has a large influence on the electromagnetic induction, and when the temperature exceeds 130 ℃, the magnetic force is disabled, so that the thermocouple 201 is provided for sensing the real-time temperature of the work table 200 so as not to exceed the set safe temperature. The magnetic workbench 200 is further provided with a negative pressure air hole 205 for providing negative pressure for paper pulp suction, and one side of the workbench 200 is provided with a junction box 207 for external power supply.
In order to control the suction force to the mold, a magnetic saturation detection device 203 may be further disposed on the magnetic workbench 200 for magnetic saturation detection, after the workbench 200 is powered on, the workbench may work further only if a certain set safety value of the magnetic suction force is reached, and if the set safety value is lower than the set safety value, a certain risk may exist.
A proximity sensor 206 is arranged to sense whether the mold 9 is installed on the working stress surface 204 of the magnetic workbench 200 or not, whether the mold 9 is loaded on the workbench 200 or not is detected in real time, and the machine can work further only if the mold 9 is loaded.
The magnetic workbench 200 is provided with an accidental power failure self-locking device, the demagnetization function is automatically locked when an accidental power failure occurs in the operation process, and the self-locking function is manually eliminated after a power supply is turned on again. This function prevents accidental injury from occurring.
The magnetic pole structure of the magnetic workbench is designed as follows, a steel shell is arranged outside the magnetic pole, an induction electromagnetic coil is arranged right below the magnetic pole, and epoxy resin is filled in the gap inside the magnetic pole block at the upper part of the magnetic pole so as to prevent liquid from entering the magnetic pole and burning the coil. The whole magnetic pole is of a solid structure and has enough strength and rigidity. The size and height ratio of the upper layer and the lower layer can be optimally determined according to the strength requirement of the magnetic field. The optimal magnetic circuit system consists of an electromagnetic magnetic field controlled by an electric pulse switch and a permanent magnetic field using a permanent magnetic material.
The specific operation steps are as follows:
a. and (3) locking the mould: placing the mold 9 on the working force-bearing surface 204 of the magnetic worktable 200, when the coils on the left and right sides of the lower part of the magnetic pole are energized with current, the magnetic field strength reaches the maximum when the magnetic induction directions of the electric control magnetic field and the permanent magnet magnetic field are the same, generating magnetic attraction force on the mold or the workpiece placed on the surface of the sucker through the magnetic induction lines, and externally representing the mold 9 as magnetizing (as shown in fig. 4 a), so that the mold 9 is in a clamping state;
b. and (3) loosening operation of the mold: when the coils on the left side and the right side of the lower part of the magnetic pole are electrified reversely, so that the direction of the magnetic induction intensity of the electric control magnetic field is opposite to that of the permanent magnet magnetic field, the magnetic field intensity reaches the minimum, the external characteristic is demagnetization (as shown in figure 4 b), and the die is in a loose state.
The electrifying time for magnetizing or demagnetizing the electric permanent magnetic chuck is generally less than 1s, and the clamping and loosening efficiency of the workpiece or the die is very high.
The basic circuit operating principle of the working table 200 refers to the circuit diagram of fig. 5.
(1) Magnetizing process
Pressing a magnetizing inching button SB2, powering a contactor KM1 to attract and self-lock, closing a main contact, powering an induction coil YH of the workbench, magnetizing the workbench 200 and attracting the die; meanwhile, the contactor KM1 assists in breaking the break contact, so that the contactor KM2 cannot be powered, and interlocking is realized. When the mold needs to be molded after the mold is produced, the jog button SB1 is pressed first to cut off the dc power supply of the induction coil YH, and the work table 200 and the mold 9 both have residual magnetism, so that further demagnetization is required.
(2) Demagnetization process
Pressing the click button SB3, attracting the contactor KM2 with electricity, closing the two main contacts, and introducing reverse direct current into the electromagnetic workbench 200 to demagnetize the workbench 200 and the die 9; in order to prevent the work table from being reversely magnetized due to an excessively long time and to suck the mold again during demagnetization, the contactor KM2 adopts inching control.
(3) Description of the elements
The protection device comprises discharge resistor R, capacitor C and undervoltage relay KUD, and the effect of resistor R and capacitor C is, at the in-process that magnetizes, electromagnetic worktable stores magnetic field energy, in the one-time that breaks away from the power, the both ends of induction coil YH produce great self-induced electromotive force, can make coil and other electrical components damage, consequently constitute discharge circuit with resistor and capacitor, utilize the characteristic that the voltage on capacitor C both sides can not break suddenly promptly, make YH both ends's voltage change tend to slow down, utilize the resistance to consume the electromagnetic energy.
The mould 9 of the paper pulp molding product shown in figure 2 is provided with a constant temperature coil heating device which comprises a mould heating ring 2 and a temperature control device, wherein the mould heating ring 2 is arranged on the front side and the back side of the mould 9, a groove is formed around a mould cavity 5, the mould heating ring 2 is arranged in the groove, the mould heating ring 2 is connected with a power supply through interfaces on the two sides of the mould, and a plurality of thermocouples 3 are arranged on a hot-pressing lower mould 1 for measuring the temperature around a mould core 5. The loops of the mold heating rings 2 on the front side and the back side of the mold 9 can be the same or different. The loops on the front side and the back side of the mold 9 in this embodiment are different according to the structure of the mold core. The mold heating ring 2 is placed in the groove, and a U-shaped copper pressing strip 6 is added to the upper half part of the mold heating ring to be attached to the surface of the mold (as shown in figure 3). The mold core 5 is arranged in the mold plate of the hot-pressing lower mold 1 in an integral or embedded mode, the heating coil 2 is provided with a groove around the mold core 5 on the mold plate, the heating resistance wire 7 is arranged in the stainless steel shell 8 and is arranged in the groove around the mold core 5, the U-shaped copper pressing strip 6 is added to the upper half part of the mold to be attached to the surface of the mold, and then the mold is filled with a thermal insulation material. The loop design required for different mold cavity/core 5 arrangements is also different, so that a thermal balance analysis is required before grooving. The design of the loop of the mold heating ring 2 conforms to the requirement of thermal balance, and the temperature deviation of the mold cavity/mold core 5 circles is controlled within +/-2 ℃.
Fig. 6 shows the pulp molding apparatus of the present invention, wherein the temperature control box 11 is connected to the mold heating ring 2, and is installed at one side of the machine platform to perform the functions of temperature setting and monitoring. The forming machine 13 controls the heating temperature of the worktable through a temperature control element, and the heating ring 2 passes throughLine set 1,221 andwire group 3,4,5,622 is connected with the temperature control box 11 integrated at the inner side of the finished machine platform, and the operation screen 12 is connected with the temperature control box 11.
The paper pulp molding forming equipment comprises a forming machine 13, the honeycomb type electric permanent magnet rapid mode locking device and a mold 9, wherein the mold 9 comprises a mold heating ring 2 and a temperature control device, the forming machine 13 is connected with a temperature control box 11 and the mold heating ring 2, and the operation is controlled by a PLC (programmable logic controller) and is displayed on an operation screen 12 of the forming machine in real time; the upper die magnetic force workbench 411 and the lower die magnetic force workbench 412 of the honeycomb type electro-permanent-magnet rapid mode locking device are controlled by the main control box 400 to be magnetized and demagnetized, so that the locking and the releasing of the die 9 are completed; the main control box 400 simultaneously feeds back information and displays it through the operation panel 12 connected to the molding machine.
When the paper pulp molding machine works, the total power of the upper and lower templates of the hot pressing station of the paper pulp molding machine 13 is designed to be 84kw, time and electricity are saved at the moment, the time for the mold to rise from room temperature to the required time can be controlled to be about 10min, the heating temperature is set through the temperature control box 11 (the working temperature is set to be 130 ℃ in the embodiment), the current is conducted to the periphery of the mold core 5 through the heating tube resistor 7 in the mold heating ring 2 to enable the temperature to rise to the set temperature, and the power supply is cut off when the temperature exceeds the upper limit of the set value under the detection of the thermocouple 3, or the power supply is recovered. The invention ensures that the temperature of the mold core is uniform, the temperature deviation of the periphery is controlled within +/-2 ℃, and the precision can reach +/-0.5 ℃. The invention has real-time and accurate temperature control, ensures the consistent surface temperature of the paper pulp molding shaping die, thereby ensuring the dimensional stability of the paper pulp molding product, reducing the deformation of the product and the like, improving the yield of the paper pulp molding product, reducing the power consumption, saving energy with high efficiency and saving electricity by more than 300 percent.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (5)
1. A honeycomb type electric permanent magnet fast mode locking device of paper pulp molding equipment comprises a magnetic workbench, wherein a mold is arranged on the magnetic workbench, and the honeycomb type electric permanent magnet fast mode locking device is characterized in that the magnetic workbench comprises a working stress surface and a magnetic pole device, a temperature detection device, a magnetic flux detection device for controlling suction force, a distance sensing device for sensing whether the mold is installed or not and an accidental power failure self-locking device are arranged on the magnetic workbench; the temperature detection device detects and monitors temperature change and is used for sensing the real-time temperature of the magnetic workbench so as not to exceed a set safe temperature; the magnetic pole device is structurally characterized in that a steel shell is arranged outside a magnetic pole, an induction electromagnetic coil is arranged right below the steel shell, and epoxy resin is filled in a gap inside a magnetic pole block of the magnetic pole; the magnetic pole devices and the magnetic flux detection devices on the magnetic workbench are uniformly distributed and are in a honeycomb shape.
2. The method for operating a honeycomb type electro-permanent magnet fast mold clamping device of a pulp molding apparatus according to claim 1, characterized by comprising the steps of:
a. and (3) locking the mould: when current is introduced into the coils on the left side and the right side of the lower part of the magnetic pole, the magnetic field intensity of the electric control magnetic field is the same as the magnetic induction intensity direction of the permanent magnet magnetic field, the magnetic field intensity reaches the maximum, magnetic attraction is generated on a mould or a workpiece placed on the surface of the sucking disc through the magnetic induction lines, the external characteristic is magnetization, and the mould is in a clamping state;
b. and (3) loosening operation of the mold: when the coils on the left side and the right side of the lower part of the magnetic pole are reversely electrified to enable the direction of the magnetic induction intensity of the electric control magnetic field to be opposite to that of the permanent magnet magnetic field, the magnetic field intensity reaches the minimum, the external representation is demagnetization, and the mold is in a loose state.
3. A pulp molding forming device comprises a forming machine, a honeycomb type electric permanent magnet rapid mode locking device and a mold, wherein the honeycomb type electric permanent magnet rapid mode locking device comprises a mold heating ring and a temperature control device, the forming machine is connected with the temperature control device and the mold heating ring, and the operation is controlled by a PLC and displayed on an operation screen of the forming machine in real time; the control module controls the honeycomb type electric permanent magnet rapid mode locking device to complete locking and unlocking of the mold; the control module simultaneously feeds back information and displays it through an operation screen connected to the molding machine.
4. The pulp molding apparatus of claim 3, wherein the mold heating ring is grooved around the mold cavity and/or the mold core and the mold heating ring is placed in the groove.
5. The pulp molding apparatus according to claim 4, wherein the temperature control device is connected to the mold heating ring, and the heating temperature of the table is controlled by a temperature control element.
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